47555domain: NAppears in sequencesExpansion of (1-x) * (1+x) / ((1-2*x)*(1-x-x^2)).at n=14A104004Irregular triangle read by rows: T(n,k) is the number of primes with n balanced ternary digits of which 2k+1 (3 <= 2k+1 <= n) are nonzero.at n=40A277514